<pre class="shiki github-dark shaku"><code>type ToNumber&lt;T extends string&gt; = T extends `${infer First extends number}` ? First : never;</code></pre>

This is my accepted solution

Implement ToNumber<T> to get an integer number type from integer string. type A = ToNumber<'1'> // 1type B = ToNumber<'40'> // 40type C = ToNumber<'0'…